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Monitoring of Elastic and Petrophysical Material Parameters of a Synthetic CAES Storage Site by 2D Waveform Inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
Renewable energy resources are intermittent and need buffer storage to bridge the time-gap between production and demand peaks. The North German Basin has a very large capacity for Compressed Air Energy Storage (CAES) in porous saltwater aquifers and salt cavities. Replacing pore brine with compressed gas within the reservoir formation causes only small changes in seismic P-/S-wave velocities and density. Therefore a very sensitive seismic imaging technique is required. Using a realistic virtual CAES injection scenario into a shallow saltwater aquifer, we demonstrate the resolution of an elastic 2D waveform inversion to map the shape and elastic properties of a gas plume with gradual saturation depletion with depth. By inverting the underlying rock model we are able to estimate the gas saturation distribution. Furthermore the influence of Gaussian noise on the inversion results is investigated.